Downloading PicView win-x64 self-contained.zip doesn't require installation, just extract and run it.
Same with PicView win-x64 Framework-Dependent.zip, but requires requires .NET Core 3.1 installed to run it.
Change-log Improved zooming, better startup behavior, style touch-up, updated shortcuts, fixes to drag and drop issues, added option to browse sub-directories in the settings window F4.